#' solar elevation angles of LanZhou.
#'
#' A dataset containing the annual solar elevation angles at 12 o 'clock in Lanzhou.
#'
#'@docType data
#'@name LanZhou
#'
#' @format A data frame with 365 rows and 2 variables:
#' \describe{
#'   \item{Date}{date_time from "2021/01/01 12:00:00" to "2021/12/31 12:00:00"}
#'   \item{H}{The solar elevation angles at 12 o 'clock in Lanzhou}
#'   ...
#' }
"LanZhou"
